Hemopatch® is indicated as a hemostatic device in procedures when the surgical control of bleeding by pressure, ligation, or conventional methods is inefficient or impractical. It consists in a soft, thin, foldable, and flexible collagen patch derived from bovine skin, and NHS-PEG coated (pentaerythritol polyethylene glycol ether tetrasuccinimidil glutarate). The white face, which is applied on the tissue, is covered with a thin layer of NHS-PEG providing a firm adherence to it, thus sealing the bleeding surface and inducing hemostasis at the same time. Because of its flexible structure, the application of Hemopatch ® on the site to achieve hemostasis is easily controlled. The uncoated side is marked with blue squares of a biocompatible dye, to differentiate it from the coated side.